Actually, if everybody knew that a channel is insecure, it would make it a lot less dangerous. The problem is: most of people need it to be safer, and there is no real option.
A) if you and your contact knows that a channel is compromised, you'll be able to adapt if needed. But if one thinks it is safe, the other don't care about its safeness and it happens to be a compromised channel, the first guy might be in trouble. (B) If the default option was something architecturally safer (like encrypted decentralized mail), they would be able to trust it without need to fully trust the other parts envolved (contact and service).
I was hoping you'd prove that most people consider Skype to be secure, for A, because that's what you claimed. As for B, there are many other options, I don't really know what you mean by "they would be able to trust it without need to fully trust the other parts envolved (contact and service)." Are you saying PGP is backdoored? Do you know something we don't?
